+ + 4-+ , marked homogenous erythema ; +++, homogenous erythema; ++, patchy erythema; +, slight erythema; 01, no reaction.An additional designation of t to indicate minimal reaction has been added.After reading of skin tests, hair was clipped from the $abdominal surface and 15 nd of sterile light minleral oil was injected intraperitoneally to evokle exudabive cells. Seventytwo b u r s after oil injection, animals were exsianguinated by inkracardial puncture, and peritoneal exudate cells were collected. For this collection, the abdominal wall was opened and the cavity washed 3 times with s t d eHanks balanced salt solution ( 1 1 ) , modified by the addition of 0.1% gelatin.
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